Number of n X n 0..3 arrays avoiding the pattern z+1 z+1 z horizontally and z-1 z-1 z vertically.
A207576
Number of n X n 0..3 arrays avoiding the pattern z+1 z+1 z horizontally and z-1 z-1 z vertically.
Terms
- a(0) =4a(1) =256a(2) =196916a(3) =1970169608
External references
- oeis: A207576